CVE-2026-59843
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
A flaw was found in libssh. A remote authenticated peer can advertise a zero maximum packet size in SSH_MSG_CHANNEL_OPEN, causing later channel writes to loop indefinitely and consume CPU, leading to denial of service.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | 0:0.12.0-3.el10_2 < * | unaffected |
| Red Hat | Red Hat Enterprise Linux 8 | 0:0.9.6-17.el8_10 < * | unaffected |
| Red Hat | Red Hat Enterprise Linux 8 | 0:0.9.6-17.el8_10 < * | unaffected |
| Red Hat | Red Hat Enterprise Linux 9 | 0:0.10.4-19.el9_8 < * | unaffected |
| Red Hat | Red Hat Enterprise Linux 9 | 0:0.10.4-19.el9_8 < * | unaffected |
| Red Hat | Red Hat Hardened Images | 0.12.1-4.hum1 < * | unaffected |
Weaknesses
- CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
Workarounds
No workaround available.
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://access.redhat.com/errata/RHSA-2026:42922
- https://access.redhat.com/errata/RHSA-2026:55855
- https://access.redhat.com/errata/RHSA-2026:62217
- https://access.redhat.com/errata/RHSA-2026:62218
- https://access.redhat.com/security/cve/CVE-2026-59843
- https://bugzilla.redhat.com/show_bug.cgi?id=2498176
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